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STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 204,310 $ 154,761
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 97,123 103,213
Amortization 719 719
Deferred income taxes 166,389 108,968
Stock-based compensation 8,381 8,656
Loss on disposal of fixed assets 37 0
Changes in:    
Receivables (101,539) (238,115)
Inventory 206,025 83,081
Prepaid expenses and other assets (44,666) (43,965)
Accrued expenses (22,969) (64,895)
Accounts payable (68,510) 79,429
Net cash provided by operating activities 445,300 191,852
CASH FLOWS FROM INVESTING ACTIVITES :    
Purchase of property, plant and equipment (8,949) (112,463)
Maturities of short-term investments 500,000 1,195,000
Purchases of short-term investments (1,245,000) (500,000)
Net cash (used for) provided by investing activities (753,949) 582,537
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (44,633) (42,483)
Proceeds from exercise of stock options 0 50,800
Tax benefits related to stock options 0 6,842
Net cash (used for) provided by financing activities (44,633) 15,159
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (353,282) 789,548
BEGINNING CASH AND CASH EQUIVALENTS 2,673,719 781,516
ENDING CASH AND CASH EQUIVALENTS 2,320,437 1,571,064
INCOME TAXES PAID 0 (152)
INTEREST EXPENSE PAID (17,327) (19,586)
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable 8,357 (9,693)
Net change in fair value of interest rate swap $ (5,810) $ (5,610)